San Francisco — Google is refining its famous logo as it prepares to become a part of a new holding company called Alphabet.

The revised design unveiled Tuesday features the same mix of blue, red, yellow and green that Google has been using throughout its nearly 17-year history, though the hues are slightly different shades.

Google also invented a new typeface called "Product Sans" that is meant to resemble the simple printing in a grade-school book. It will replace a serif typeface that Google has been using in its logo for more than 16 years. The "e'' in the company's name will remain slightly tilted to reflect Google's sometimes off-kilter thinking.

Although this will be the sixth time that Google has changed its logo since Larry Page and Sergey Brin formed the company, this marks the most noticeable redesign since it dropped an exclamation point that appeared after its name until May 1999

The Mountain View, California, company is pouring so much money into so many far-flung projects that have little or no connection to its main business of online search and advertising that it's getting ready to place everything under the Alphabet umbrella.

Under this setup, Google will retain search, YouTube and most of the biggest divisions while smaller operations such as Nest home appliances, life sciences, drone deliveries and venture capital investments will operate as individual companies. All will be overseen by Alphabet, whose CEO will be the Google co-founder Page.

Alphabet hasn't revealed what its logo will be yet, but the holding company isn't expected to be officially operating for a few more months.